ACTIVITY NO. 2

LET’S MARK THE BOUNDARIES

OBJECTIVES1. Describe the distribution of active

volcanoes, earthquake epicenters, and major mountain belts.

2. Determine the scientific basis for dividing the Lithospheric plates.

MATERIALS• (Fig. 5)Map of earthquake distribution• (Fig. 6)Map of active volcanoes of the

world• (Fig. 7)Mountain ranges of the world• 2 pcs. Plastic sheet used for book cover,

same size as a book page.• Making Pens ( two different colors)

PROCEDURE1. Study Figure 5 showing the

earthquake distribution around the world. Trace the approximate locations of several earthquake “clusters” using a marking pen on one of the plastic sheets.

QUESTIONSQ5. How are earthquakes distributed

on the map?Q6. Where are they located?Q7. Where are there no earthquakes?Q8. Why is it important for us to

identify areas which are prone to earthquakes?

PROCEDURE2. Study the map of active

volcanoes in Figure 6.

QUESTIONSQ9. How are volcanoes

distributed?Q10. Where are they located?Q11. Based on the map, mention a

country that is unlikely to experience a volcanic eruption?

PROCEDURE3. On the second plastic sheet,

sketch the approximate locations of several volcanoes using a marking pen.

4. Place the earthquake plastic sheet over the volcano plastic sheet.

QUESTIONSQ12. Compare the location of

majority of earthquake epicenters with the location of volcanoes around the world.

PROCEDURE

5. Study Figure 7, the orange portions indicate mountain ranges of the world.

QUESTIONSQ13. How will you relate the

distribution of mountain ranges with the distribution of earthquake epicenters and volcanoes?

PROCEDURE

6. Now that you have seen the location of volcanoes, mountain ranges, and majority of earthquake epicenters, study Figure 2. Map of Plate Boundaries.

QUESTIONSQ14. What do you think is

the basis of scientists in dividing Earth’s lithosphere into several plates?

Let’s check your answers!Q5. The world’s earthquake are not

randomly distributed over the Earth’s surface. They tend to be concentrated in narrow zones.

Q6. Some are located near the edges of the continents, some are in mid-continents, while others are in oceans.

Let’s check your answers!Q7. Large part of the Pacific

ocean, northernmost Asia, majority of Europe, eastern portion of North and South America and western Africa.

Let’s check your answers!Q8. It is important to identify

areas which are prone to earthquakes so that necessary precautions could be done if ever you’re living in one of those places.

Let’s check your answers!Q9. Volcanoes are not randomly

distributed. Majority of them are found along the edges of some continents.

Let’s check your answers!Q10. Majority are found along the

edges of some continents, particularly in the western coast of North and South America. East and South East Asia.

Q11. Answers may vary.

Let’s check your answers!Q12. Earthquake epicenters and

volcanoes are both situated at the same locations.

Q13. Mountain ranges are found in places where volcanoes and/or earthquakes epicenters are also located.

Let’s check your answers!Q14. Geologic activities such as

seismicity (occurrence of earthquakes), volcanism and mountain formation are the basis of scientists in dividing Earth’s lithosphere.